Author ORCID Identifier

https://orcid.org/0009-0000-2414-666X

Semester

Summer

Date of Graduation

2023

Document Type

Thesis

Degree Type

MS

College

Statler College of Engineering and Mineral Resources

Department

Mechanical and Aerospace Engineering

Committee Chair

Yun Chen

Committee Member

Xueyan Song

Committee Member

Cesar Romo-De-La-Cruz

Committee Member

Ever Barbero

Committee Member

Victor Mucino

Abstract

High mechanical strength integrity, high robustness towards oxidation, and high resistance to carburization under CO2 environments at elevated temperatures are usually required for metallic systems that are employed for power generation. INCONEL 625 is a nickel-based superalloy that started development in the 1950s. This material was designed with the distinct purpose of use in high-temperature and high-pressure systems. While various materials possess the physical properties to handle these conditions, the creation of IN625 addresses the need for a material to withstand the highly corrosive properties of these kinds of environments. In order to evaluate the oxidation and corrosion resistance of IN625 and SS316 in a high-temperature environment, this thesis work investigates the oxidation and corrosion mechanisms of SS316 and IN625 when subject to isothermal oxidation at 750 °C under CO2 and air environments. When exposed to an oxidative environment, both materials demonstrate a corrosion resistance mechanism of generating a protective oxide layer to protect the remaining materials, but increased spallation zones on SS316 subject to CO2 corrosion were observed. The corrosion resistance capabilities of these materials are compared using multiple different methods, including a mass change to quantify oxidation and Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), and X-ray Diffractometry (XRD) to study the consistency of structure and chemical breakdown of developed oxides. The oxidation and corrosion mechanisms for the Ni-based alloys and the stainless steels exposed to CO2 environments are studied.

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